I have a mystery that I can't solve. When you get to Siofra River, you can look out across the empty cavern and see ruins that look like they used to connect to the aquaduct running through the area. Out on the ruins, there's a lone man staring off into the "night sky". Well, you can actually get out to the other side of that empty expanse, either much later in the game, or by doing an NPC questline and betraying the guy (he's a douche so I did that). But from the other side, I couldn't find a way out to the specific piece of ruin the man was standing on. After looking again with the telescope, it's clear he's a Crucible Knight.
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Does anyone know how to get out to this guy?